diff --git a/objectid.js b/objectid.js
index 3e9f8b8..5f6d49d 100644
--- a/objectid.js
+++ b/objectid.js
@@ -313,3 +313,6 @@ var inspect = (Symbol && Symbol.for && Symbol.for('nodejs.util.inspect.custom'))
 ObjectID.prototype[inspect] = function() { return "ObjectID("+this+")" };
 ObjectID.prototype.toJSON = ObjectID.prototype.toHexString;
 ObjectID.prototype.toString = ObjectID.prototype.toHexString;
+Object.defineProperty(ObjectID.prototype, "str", {
+  get: ObjectID.prototype.toHexString
+});
diff --git a/test/test.js b/test/test.js
index 3ec6720..64ed322 100644
--- a/test/test.js
+++ b/test/test.js
@@ -123,6 +123,12 @@ describe("ObjectIDs", function() {
     o.toString().should.eql("54495ad94c934721ede76d90");
   });
 
+  it("should convert to a hex string for ObjectID.str", function() {
+    var hexString = "54495ad94c934721ede76d90";
+    var o = new ObjectID(hexString);
+    o.str.should.eql("54495ad94c934721ede76d90");
+  });
+
   it("should throw and error if constructing with an invalid string", function() {
     (function(){
       var o = new ObjectID("tttttttttttttttttttttttt");